Apparatus for bending metal rods.



Wm can R. B. HARTMAN. APPARATUS FOR BENDING METAL RODS. APPLICATION FILED JUNE 17, 1909.

Patented Oct. 22, 1912.

xii-If cg wmmm 4 UNITED sraras PATENT oFFIcE.

3mm: :2. Hears ran, or MILWAUKEE, WISCONSIN.

.QFPAMTUS FOE BENDING METAL RODS.

Specifleetien of Letters Patent.

Patented Got. 22', 1912,

Application filed June 1?, 1909. Serial no. menus.

To all whom it may concern:

Be it known that I, RUDOLPH B. HART; MAN, of Milwaukee, Wisconsin, have invented an Apparatus for Bending Metal Rods, of which the following is a specification.

My invention relatesto structural concrete work, and the object which I have in view is. to provide means for rapidly and accurately forming the reinforcement-rods into the various shapes whiclrare used to reinforce concrete structural elements, such as beams, columns, slabs and other structural forms, and one which is especially adapted for bending hoops, stirrups and other transverse reinforcements which have many bends or loops.

The apparatus comprises briefly a templettable or base providedwith holes suitably disposed upon its surface; pins fitting in and projecting from said holes; and a handlever provided atits fulcrum with an eye which turns upon any of said pins, with means for engaging the metal-rod which is to be bent.

The invention consists further of the constructions and combinations which will be hereinafter explained in connection. with the accompanying drawings, wherein Figure 1 is a perspective View of the apparatus constructed according to my invention; Fig. 2 is a section through the same in the center of one of the holes of the templet-table or base, showing the manner of turning an eye upon a reinforcing-rod or hoop; Fig. 3 is a section through the templet-table showing an improved form of pin; and Fig. 4 shows a set of pins of different sizes which may be supplied with the apparatus to adapt it to eyes and loops of different diameters.

In these drawings the same part is designated by the same reference letter in each figure.

In shaping reinforcement -stirrups and hB'dps during building-construction it becomes an important question to provide some readily available means for forming rods into any desired shape rapidly and cheaply, and inasmuch as the design of the structural elements .is difierent in each case, due to difi'erent'c'onditions of dimensions, disposition, loading, etc, a wide variation'of shape must be provided for. This is accomplished {by tho"present apparatus, which comprisessimply a templet-table or these holes fit movable "when the lever is turned.

I claim as new and I platen a having holes 6 therein atyarious points. The holes Z) are preferably disposed in regular order, as shown,-but may be disposed in any desired relation. In pins 0, said pins being formed with shanks d of a size to lit in the holes I), and with heads 6- of a size corresponding to that of thereinforcing-rods which are destined to engage in the loops or eyes formed in the stirrups. A rod f in the process of being bent into stirrup form is shown'in Fig. 1, while Fig. 2 shows a rod 9 having an eye It turned thereon. I v

For bending the rods I employ a hand lever 2', which has at its fulcrum a hole 7' adapted to fit the headsof the pins 0, which form successively the pivot upon which itis turned, and it is further provided with a peg 70 on its under side a short distance from the pivot, which catch the rod and twist 1t around the'pin This is clearly exemplified in Figs. 1 and 2 of the drawing. To prevent undue looseness ofthe pins,

the holes in the templet-table may be made tapered as shown at b in Fig. 3; in which case the pins, 0, will receive a corresponding taper, and it will be unnecessary to provide any supporting shoulder for them; and the apparatus .may be furnished with a set of pins of different-sized heads, as shown at 0 c a in Fig. 4-, corresponding to different sizes of reinforcing-bars so as to turn upon stirrups and hoopseyes or loops of corresponding diameter.

By means of my improved apparatus any of the stirrup forms and hoops, as Well as many other reinforcing forms used in concrete work, may be formed by unskilled labor.

While I have herein shown the most improved form of my apparatus it will be understood, of course, that certain changes of form and dimensions may be made without departing from the spirit of my inven tion.; 4

Having thus described my invention, what desire to secure by Letters Patent is: k A. device for shaping reinforcing-members for concrete structures, comprising a templet-table having a plurality of tapered holcs therein, a plurality of pins'. having tapered shanks fitted removably in said peg is adapted to When the lever is rotated on its fulcrum,

holes and provided with heads extended zig-zag form comprising alternate straight 10 above the face of said templet-table, and portions and bends. a lever having a hole near one end to re- In Witness whereof I have hereunto setm'ovably engage over the head of a pin to my hand this 15th day of June, 1909.

form a fulcrum for the lever and a depending projection to engage the material RUDOLPH HARTMAN' being acted upon to twist it around a pin Witnesses:

S. ROSENHEIMER,

whereby metal bars may be twisted into W. D. SCHIENBEIN.

Copies of this patent-may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, I). C. 

